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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b300e3b8663b94e8ff9e3a07df0318e10f6bf03829ee357552d9ae1cbd6a9e' 
  AND token = 'SRTObRoDTZ4W6XADTLE2XQgVhGRGdUSaoB6YTECQR/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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