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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c03d88925f0695b6908a887b8918ff5881381c77411372166de7746a83a7b6' 
  AND token = '74oNCW2SPuNSivra8H7+M+B5VbqsGKc7VFLCSpwxp5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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