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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7005939db579855f9f89e6895017008c7a6578223608aa02af0976024f544a' 
  AND token = 'ue5PIqk0IdtkZJmjl5a3AcxMq+cGGOyufqHsJWz2CR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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