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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d72c6fccbc8accfe01deea5bdc3ac155bfa1b56bd9a1c57cf2ef92867751fa5' 
  AND token = 'goPD3lPIz5ccEl8UbxsqkMpdQdCSqq52LodfnYHJGP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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