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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39924d10f1c11828a5eb961c154d1a2fc9152f02ff7b9e7b0a5b43320856f513' 
  AND token = 'DR9bgu1UcIRBOIuVs9CR5ZyMx1DzX4ViOX7sPMvexlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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