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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172832ddeab0685c8df7e4a5afc335cb6aaafbe512a1d773de09e280ca4e3faa' 
  AND token = 'jijBp+7F7vmPkr5eOPsDVD0OyOGb+dYuOmM7UvED0ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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