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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baca6ae3365db524b35c8e0c39c74dbd891fab39bd4d0f360529cc0293e2dae0' 
  AND token = 'dpXfn7bRD8xMC+foT6QctHmpAiN6NE4qsKztLBjq/7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00553

JSON explain

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