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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dc9693d8d63cab4e012764fa1400811caf30fb3c817bee9666c25cc3a055ad' 
  AND token = 'uwrHm4ltEClu9WJIoGv2fqxpmfFtGer94W1W99vsdEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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