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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82351bdecc0f911387f30817c875ea64fd930e2d7869508986cca8b42166ac9' 
  AND token = 'ZYNWD00JemiIzPWnLhfsQZ4bu43nrGtU0MgSmJ9SRPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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