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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6eff52c5db4139b1553d460bb61fc87fac675edbdeac49ae711c6a315ac7579' 
  AND token = 'MM/gzoisHDZAkVxi8YkaCgEfEdntuMZs1Jh4kFDwefo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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