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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1671e0a44eb3576179764689f29236d5b05199ddff789418a5d94451533db3a' 
  AND token = '9g9IiJbbYFbeCc7fOXu4r5E+mJUnJpq+d9y6Ks318Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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