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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcfcd69e168e8142328fcbbcb6aced0d203c62834c7f3a6ad648982ee06e8c4' 
  AND token = 'T/Dj7mWu1xcUn/8lemnVPNuNwF7RWVLyHabMN8jeqDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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