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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eddefc959daa2ae98e7a392a51f1ccdfa00cb6d0717a8e6a33b0c32db6dfdc1f' 
  AND token = 'okC7GblCoITrLAsSWzGGfxz83L7jjuENolLLX5xUdFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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