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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '371e6c2bf64e7f73bb38ef539fcbe6e0db88877378508fbbe0b04ef98344499a' 
  AND token = '/CQDsPaEur5IAwoLofTDFrYAEDDF1pqXw8D7GP0YbrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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