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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d9d66768f53d65300477a002d1112329e2f784580de92dc7a7171383962647' 
  AND token = 'xuHLdDbt212H9iOFIdG9aDDTH+IsFiuY0uASW2L+3S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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