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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce4867abab20f12107f009c3d85540b12d8f675660b3445f6815c14f6df35e2' 
  AND token = 'ScLL3He6RWiInfFAaKCYRrnHuJIRQ2Y0FimVu12JqEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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