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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b37bac83d04d97bfa72df6a95d07b5cf7fc4fe946c9e2546eaf30d2a8000a5a' 
  AND token = 'DQK/xEm2Q0+jf5gNzS3PcflQJqYFpAgsNxH37lF2/dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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