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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7987ec454e698a9672505e19c90f665eeea7332306ba910ce25d2bc05556beb7' 
  AND token = 'qm80Z0YKf/VvBBB/zpDkjR+OAa50wVerQ0n4H1bocx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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