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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01abb588e4e57223c4dbfaad7c1afe8d2bb64e368a17130f7d1678d217ac8833' 
  AND token = '1yTYr75cmY1vjnzWGzaGc40CsYYjU8d9EYC3pP5oqvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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