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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2083b9d6f4108a75ea0e8db59b5bc130e16f995056d302da66b3dc529f64eb67' 
  AND token = '5vZmBjxvOrISUnpXBorUrMiOAVxKEeWYJEbVcLL4jVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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