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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2098d1720829034a3f11bec34adea904f7d470b921a4aa335ba9c151b6094a69' 
  AND token = '3nx/oqrPvfxHeBctxDy7qDlFciQ8MUEXiy15fVig8iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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