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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf934e1ace27050ccf96043849cf4b3f6e6b59754ab8d77a23cd995943df274' 
  AND token = 'YbAp2nEM+agjO2nbM7I2FF1AIurFbrVUw9TwONY/pT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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