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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd638dae856ff0eeb9487897cd37798a2db7f30999e4bc16da7cd37ff7ae52924' 
  AND token = 'n4NGzpP/2zwDq/oXZV2wa6Jf44o9Mip/LIeCs/oa87Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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