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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a3096bc5a52739bc9ca2beb964491ccd09ff1baa9032da7b037deaf0e6ac63' 
  AND token = 'ayzAbLU4raKlrQLXioa6o63zKO0QCRn2JA9/ySJrqYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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