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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcebcc8d02c7c4076c27f70f1cbacf271f9883b259e3b0b9b7fd7c47bcd7c230' 
  AND token = 'lPXEy7XK1kXhZYWLwE6Je8aMWFR2czlaUrMfbt9TsA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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