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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b962eec21117f59b359d571b8da7f958483565b2ca9b7ecc0db0266763e11b' 
  AND token = 'VwQTfaebhbsZ9TBMoB0370UJxmj8Pb3ZKFUvH4l7Qcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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