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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951dcfaa6ff29e8750dac546ffe60c743d67b8cb51030aa53d483a5bf74365d9' 
  AND token = 'RMvDAX6CPqBxcNd8ogXRnmZb9t9ZIEhJ/Id3HPJG3SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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