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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d63d8e83910801524e79d39cdd92a002c4702ea968bdcc9cfaeba6aeb5ddaf1' 
  AND token = 'KdfRYkwcChkbTilOEg/PlUrEgfozahsR/9OXzf6v0OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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