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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b139e59645e2b4ab97c48c9bd81880d5a9d50dab63f35134afb9f4c8d4d305ad' 
  AND token = 'ZQDXSCMr71IRMyRTthISBPQ53ab2wJM0F180AQTy7fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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