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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24d02f5552e3e37d3e63f59469b5d826ef2159253201b89d93f6c9307842ec7' 
  AND token = 'l8SOzae5BD0lmokQPKsQUSVj8Ra9ibWn5xUviQ2bv4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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