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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5630de59ae84ccd68e54e4eca61a47056779a6a7d66fe50b72633c085f55613a' 
  AND token = 'H0Or9xJeq7496U1f4awVgStjuw2+AveMOpPy0cqgjZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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