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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45875b1c70bbe5a182b5024313bf145796a4daf87ac2b81103b99441f21ba904' 
  AND token = 'kqfOnnmL3t5BJIu7NOOSXyZqQi+Wr3zQJG2F5Bk8Qq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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