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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95cd0d2b2b35df5ad6ec72ec378407ef8543e218c37038519a9e00ddc01c720' 
  AND token = 'r+pl9+s1amcl96swne5vcVKM/ahOEXisCX3rp+y49AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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