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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee241eaf5804bb9e1071f46bbbabf0844778a85b72b58f3eebd9a7500305e51d' 
  AND token = 'H03cckw5YXQ0/fjl5kIc41key/UjwJD0KHF+ee9NPSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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