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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecad9f97b4e8b751345e7988981deb88d16b202d4c1b6ac9e7188585e1fa9a2' 
  AND token = 'tB1aL3P5VbqHPh4pfWsFCFt/UIHvdlpwXNo8JyS6ZS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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