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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d08d155a972f338aa2d5fc5eed5e002070df8212d3464db7a2e6e14d191e67' 
  AND token = 'OBFMagf7xL2z/smTEwhLMUr3738gLKlfs8Zdz1I5Tsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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