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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f563b13daff4a2ef6ba7f91a020c5dcad6a149356663bce2b3ae0b9e0fc936b' 
  AND token = 'Dk9as7RSXdehvL9vvx0oEt2DCqdOR5N9k5TX6QDwMZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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