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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6f60d5431d19df0490fa4c0ae2c8d1abc55ab1bac840c55f728ead0b1bdfea' 
  AND token = 'F/j7q27bdoNfT75KDTNokzD9XijWNcbqRVVm2idMC8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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