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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1828c301c3358987b004381230d1c09be4d8782542c929851d861fabebb541' 
  AND token = 'Hk6av8BqJgpxa32SGfajW1x1+sGlYYsbvkpf6h09cIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}