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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8774568f068354e7e47a87843eb016994088fbfcfdad32789c97ebe0db00ba42' 
  AND token = 'iHSOpSgFgEGS86zGQN9mE4/BNQ6Unu605q0knsc9UoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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