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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1558ef5a052bc454b9d6495158c47a07f53a8e16510bc2a3f7fa7ebf2a7183b' 
  AND token = 'EfjFXAz8uyHRaKNYUmEtxQBVy1fZQAgeUSVGWZBu7Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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