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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703f4291450038a3c8d3486d3f053d1b5391502f2fd884585c82f788868a0bdf' 
  AND token = 'EKeB5tDQaWJ18QmtBfOW46hIoKtZWD691KRLej8OwBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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