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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cb3357e971194b6a6a5bc9f434029ccc4d4cdb7af7e9bdbb47ca024860d6e76' 
  AND token = 'O+GCHO7RPs/4wovP0d8QX43FGC5zT8U3c617qH1T0KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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