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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6add545a53ffd29a7511cf937fa965c3efe959a43a56aa8c7b85e2159eca2f66' 
  AND token = 'YxYtDh4QXDRS13+KK3bWM/8FpfyE1rIV2xJ+3q4+M+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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