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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a56f761a75871febd270e2727c0e8f58d230a858de50f335c22a2ea1bf7a8a5' 
  AND token = 'K0uO1t5LFHjODsH6bh5nU3BmbL1/WxdFmS7mLZQLFM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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