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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6a26e13464a8bbbcbfd220df8a653af1f97318af352d4878b28a1313193bfd' 
  AND token = 'lvplt2oL1+2XEVz0IqGH2M67JVcU819ojPf3+6XI4NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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