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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ba71f81af6e124e5f8b35174215f631b99a1c975f84f65be97d4277f4cfeb8' 
  AND token = 'Eawp5ur+OopZLcMpr6fsXF8A1S/BebYLj4kcakap51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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