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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ad39c9ff06a38996ce5d6c4eb250da13ee3e71f121e0f6cd6fd42d3c3a696e' 
  AND token = 'QfzeFBXvLUFfwkSh5JzafuNTDBkgTt5h5rKNDCG7Y68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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