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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c08cdd43655d6ee9f27f2b0f6818a29f4b0e840b7982e229e6cb8b3b98435d3' 
  AND token = 'Hd6c3gWdc+2qPY4ZH3M6BOYSCzLDtZzSBZ49LmDjKXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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