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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aef51ea984d5e6204163d685adc1897886260c54b2746aa21c2509984ff28b4' 
  AND token = 'V8rxIeVjhLoa9/v+XeqqGGVBnLgY8LVb4XtterSd5OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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