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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb2caf84cc3d76511007a082703abe2d295394c32be0a0ac7ea75e01fef7faa' 
  AND token = 'ZWSaqQaPu1ZPSLQSc/q+HsEkZPSWFUkQ+lyKE/Lkf28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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