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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95a4a4dd670c1aeef3c8b5acfe8b49223525e6f79871d965629be37669752a20' 
  AND token = 'DkriyxYZy7nP5GiSMbZw6bpisLZpKp+5ask9Ploj2bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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