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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e08b15681848587d1a30389373290d2df857121297591a5ee2e2b308370b73' 
  AND token = 'TpzvM7csqYkTTQZJGbb08il4/3g8oD0aPlZbvY3FX1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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