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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68567936891c8bf46cd7e11b2acf27c2030f85aed5cc52c585c412568968d96' 
  AND token = '3rBIqJFE9IC/kmjg2PBg8Eo70epWZAU9uX5puVC3YrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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