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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d9c8742652585b02d0578256723226b3c0c02da2a19779edf5835269a320ba' 
  AND token = 'RhTRrJniCB658a8VSYfcaZ7xKUXwEsqBOBmt/8TI3m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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