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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cc94d2a0107f25911284cc10eb9bf5eae5400b203dd8275e003b03b17dfdeb' 
  AND token = 'k/Mq2MqD3HVmFVTL+inIIP9Kff71ie28lXU1+2wDEkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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