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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2971d62c3679d11c5a39ced33034bff01bb95e586870e29b30e9c55e8a8d90' 
  AND token = 'FfY4P3RNADY7CebTjIU7zmQzATVATf77Wj1Uen7vnjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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