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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8013e6ec0ceec6a46298122616d3a56db37977451d23663bda6c67bdef05dfd' 
  AND token = 'IarNkAnyGiI2+ZF4M9zGMbqkVSCjZnL0f8054eGd06g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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